tanatan2a/(tan2a-tana)+根号3(sin^2a-cos^2)=2sin(2a-派/3) 证明下
问题描述:
tanatan2a/(tan2a-tana)+根号3(sin^2a-cos^2)=2sin(2a-派/3) 证明下
sin2a怎么来得请说详细
答
(tanatan2a)/(tan2a-tana)+根号3(sin^2a-cos^2a)=2sin(2a-派/3)tana=tan(2a-a)=(tan2a-tana)/(1+tan2atana) 所以tan2a-tana=tana(1+tan2atana)所以(tanatan2a)/(tan2a-tana)=(tanatan2a)/tana(1+tan2atana)=tan2a/...